Rolls Book Tops Bestseller List

May 24, 2007

The Volumetrics Eating Plan by Dr. Barbara Rolls, holder of the Helen A. Guthrie Chair in Nutrition and director of the Laboratory for the Study of Human Ingestive Behavior in the Penn State College of Health and Human Development, is ranked first on the New York Times Paperback Advice Bestseller List for the week of May 27, and The Volumetrics Weight-Control Plan, published in 2002, is ranked eighth. In the May 21 paperback ratings of Publisher‚s Weekly, The Volumetrics Eating Plan ranks 14th among all paperbacks.

Rolls has gained national media attention for her Volumetrics books. The Volumetrics Eating Plan, which was released in paperback earlier this month, was the top-rated diet by Consumer Reports in its June issue. Newsweek also profiled the Volumetrics plan in its March 10, 2007, issue as “the most popular diet you've never heard of.”

In labs and in real-world settings, Rolls has demonstrated that a food's “energy density” the number of calories per unit of weight influences how full people feel and, therefore, how much they eat. Low energy-dense foods such as fruits and vegetables, which tend to have high water content, allow people to feel full while consuming fewer calories. She has received funding from sources including the National Institutes of Health, United States Department of Agriculture, and the Robert Wood Johnson Foundation, and her research has been published in numerous peer-reviewed publications. Her books show people how to lose weight by consuming fewer calories–without feeling hungry.

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Editors: For additional information, please contact the College of Health and Human Development Office of College Relations at (814) 865-3831 or